Minimise size of serial string we copy in BF1 stats to avoid overflow.
diff --git a/driver-bitfury.c b/driver-bitfury.c
index 2e0b163..84ac35a 100644
--- a/driver-bitfury.c
+++ b/driver-bitfury.c
@@ -266,7 +266,7 @@ static struct api_data *bitfury_api_stats(struct cgpu_info *cgpu)
version = info->version;
root = api_add_int(root, "Version", &version, true);
root = api_add_string(root, "Product", info->product, false);
- sprintf(serial, "%0x", info->serial);
+ sprintf(serial, "%08x", info->serial);
root = api_add_string(root, "Serial", serial, true);
return root;